<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- <style type="text/css">
#imgDemo{
	width: 200px;
	height: 200px;
}
</style> -->
</head>
<body>

	<button id="addBut">单击放大</button>
	<button id="reduceBut">单击缩小</button>
	<button id="returnBut">回复到原始大小</button>
	<button id="changeBut">改变图片内容</button>
	
	<br>
	<img src="cat1.jpg" id="imgDemo"
	width="200" height="200">
	
	
<script type="text/javascript" src="html5Day04Dom.js"></script>
</body>
</html>